JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 14
·12045-12054
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IF 2.324
Huang Zhaohui,Chen Hui,Zhao Lei,He Xuan,Fang Wei,Du Yingying,Li Weixin,Wang Guanghui,Zhang Fuqing
With increasing concern about the problems of environmental pollution and energy, the visible light photocatalytic for dye degradation is receiving considerable attention. CdSe quantum dot (CdSe QDs) sensitized MIL-125/TiO 2 @SiO 2 biogenic hierarchical materials (CMTS) has been fabricated through dual modification of CdSe with TiO 2 and MIL-125, that is the metal–organic framework (MOF) with Ti ions as metal centers and terephthalic acid as the organic ligand. The hierarchical porous heterostructured MIL-125/TiO 2 @SiO 2 composites are firstly obtained by a biogenic-templated method using rice husk as biomorphic. CdSe QDs as sensitizer is further deposited on MIL-125/TiO 2 @SiO 2 via a dipping method. This strategy applies CdSe, MIL-125, and TiO 2 undergo a two-level heterostructure, setting a stage for efficient charge separation. In addition, CMTS possesses a hierarchical porous structure in scale from micrometer to nanometer with high BET surface area. As a result, the CMTS can efficiently adsorption target, improving light harvesting and promoting degradation of organic waste from water. Meanwhile, Rhodamine B aqueous solution can be degraded more than 98% by CMTS in 100 min under visible light irradiation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of the American Chemical Society
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2025
·
IF 15.6
Xu Cao,Jiongzhao Li,Xudong Qian,Chuyue Li,Xiaogang Peng
Here, we demonstrate that monocrystalline (free of stacking faults) wurtzite CdSe nanocrystals with monodisperse size, shape (dots, rods, or wires), and facet structure are synthesized in both strongly confined and weakly confined size regimes. Considering the unique c-axis of wurtzite CdSe, we introduce a new type of neutral ligand (e.g., zinc-alkanoate ones) to pair with their dominating nonpolar low-index facets. Nucleation of the stacking fault-free wurtzite seeds instead of zinc-blende tetrahedrons is identified as the key step, which is optimized by a set of conditions matching the neutral zinc-alkanoate ligands. In the following growth stage, conditions are much less stringent, although the neutral zinc-alkanoate ligands are still critical in achieving nearly atomically flat facets of those monocrystalline nanocrystals. In the strongly confined size regime, the ensemble photoluminescence (PL) full-width-at-half-maximum (FWHM) of wurtzite CdSe nanocrystals reaches a record low (59 meV). In the weakly confined size regime, dual-peak PL caused by thermal population is observed. Monodisperse and monocrystalline wurtzite CdSe nanocrystals show distinctively size-dependent optical properties, in comparison with their zinc-blende counterparts. Results here suggest that the atomically precise synthesis of colloidal semiconductor nanocrystals is feasible, implying an advanced class of nanomaterials for exploring various optical and optoelectronic applications.
研究领域:
材料科学
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纳米技术
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
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2020
·
IF 14.612
Liulin Lv,Jiongzhao Li,Yonghong Wang,Yufei Shu,Xiaogang Peng
Zinc-blende CdSe quantum dots (QDs) encased in six equal (100) facets are synthesized in a noncoordinating solvent. Their monodispersed size, unique facet structure, and single crystallinity render the narrowest ensemble photoluminescence for CdSe QDs (full width at half-maximum being 52 meV). The nucleation stage can selectively form small-size CdSe QDs (≤3 nm) as seeds suited for the growth of cube-shaped QDs by reducing the concentration of cadmium carboxylates (Cd(RCOO)2) as the sole source of ligands. While resulting in poorly controlled nucleation, chloride-ion ligands introduced in the form of soluble CdClx(RCOO)1–x (x = 0.1∼0.2) would thermodynamically stabilize the cadmium-terminated (100) facets yet kinetically accelerate the deposition of selenium ions onto the (100) facets. Results suggest that it is fully feasible to synthesize QDs simultaneously with monodisperse size and surface structure through ligand-controlled nucleation and growth.
研究领域:
材料科学
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纳米技术
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化学合成
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2022
·
IF 9.224
Zilu Zhou,Yihan Pu,Wei Liu,Miaomiao Jin,Mo Xian
Quantum dots (QDs) are widely used in sensors, photovoltaic cells, and other fields due to their unique structural and optical properties. Physical and chemical methods that are commonly used for the synthesis of QDs require high-temperature and high-pressure environments, as well as toxic reagents. Biosynthesis overcomes these limitations and offers a novel method for producing QDs that is both cost-effective and environmentally friendly. Mercaptan substances in organisms play a key role in the synthesis of QDs, such as glutathione (GSH) and plant chelating peptides. However, the preparation of QDs using metallothionein (MT) has rarely been reported, and the synthesis mechanism is lacking. In this paper, we describe the in vivo biosynthesis of CdSe QDs by recombinant Escherichia coli expressing metallothionein, which has a synthetic advantage compared to the original strain. The fluorescence emission spectrum of the synthesized QDs was located at 550 nm with a Stokes shift of 140 nm, and the yield of the biological QDs was calculated to be 2.91%. Furthermore, the role of metallothionein in the synthesis of QDs was tentatively validated. The initial nucleus of the QDs is proposed to be originating from the Cys-Cd, followed by the subsequent introduction of the HSe– group, and its coordination with Cd2+ promotes layer-by-layer growth. Here, we established a green, mild, and efficient in vivo synthesis pathway for QDs, providing more possibilities for the synthesis of biological QDs in the future.
研究领域:
生物化学
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纳米生物学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2017
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IF 7.504
Ping Wang,Minmin Wang,Jie Zhang,Chuanping Li,Xiaolong Xu,Yongdong Jin
Colloidal semiconductor quantum dots (QDs) have recently emerged as a good candidate for photocatalytic hydrogen (H2) evolution in water. A further understanding of the factors that can affect and boost the catalytic activity of the QD-based H2-generating system is of great importance for the future design of such systems for practical use. Here, we report on the fine shell thickness engineering of colloidal CdS/CdSe core/shell QDs and its effect on the photocatalytic H2 production in water. Our results show that, with the proper shell thickness, the H2 photogeneration quantum yield (ΦH2) of CdS/CdSe core/shell QDs could reach 30.9% under the illumination of 420 nm light, which is 49% larger than that of the CdS core. Furthermore, the underlying mechanism has also been tentatively proposed and discussed.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Zhengwei Zhang,Jiao Chen,Qiulian Yang,Kai Lan,Zhengyu Yan,Jianqiu Chen
Currently, the bio-immobilization methods displayed great potential for the removal and recycle of highly toxic metals depending on their gentle and orderly regulated cellular environment. Herein, we have presented a facile and eco-friendly strategy for bio-immobilizing cadmium (Cd) ions and to harvest CdSe quantum dots (QDs) using microalgae cells as bio-reactors. The production process has good environmental benefits for recycling hazardous Cd metal. The biosynthesized CdSe QDs exhibited superior optical properties, good water-solubility, high crystallinity structure, and were monodispersed sphere nanoparticles with approximate range of 5–6 nm in size, clearly comfirmed by the inversed fluorescent microscope, Ultraviolet-visible, photoluminescence, transmission electron microscopy analyses and so on. Owning to their fluorescence quenching effect, the as-obtained CdSe QDs could be deemed as an effective fluorencent nanoprobe for imatinib detection. The linear range for imatinib was calculated to be from 10.43 μg mL −1 to 417.30 μg mL −1 with a low detection limit of 0.014 μg mL −1 . More strikingly, the possible formation mechanism of CdSe QDs in algal cells was preliminarily speculated that could be related with the intracellular GSH, which could provide new insights for the possibility for environmental transformation of poisonous metals to fluorescent QDs.
研究领域:
生物化学
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环境科学
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纳米医学
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产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
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2019
·
IF 3.839
Biwei Wang,Limin Liu,Yi Zhang,Yonghui Deng,Angang Dong
Highly luminescent colloidal nanocrystals have wide applications in bioimaging and various optoelectronic devices. Herein we report a facile and mild procedure by combining S 2− treatment and binary ligand passivation , which can efficiently enhance the luminescent property of CdSe nanocrystals at room temperature. The photoluminescence quantum yield of as-treated CdSe nanocrystals exhibits drastic enhancement ( e.g. , 188 times for CdSe nanorods) after this dual-passivation treatment. The methodology proposed here can be applied to various CdSe nanocrystals, regardless of their sizes, shapes, and crystal structures.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2015
·
IF 4.321
Zhen-Hao Tian,Jian-Hong Xu,Yu-Jun Wang,Guang-Sheng Luo
We developed a novel microfluidic method to synthesize full-color emitting CdSe semiconductor nanocrystals with good monodispersity and less amount of Cd by using mixed amines of oleylamine (OLA) and dodecyl amine (DDA) as ligands. By the control of mixed DDA and OLA, the stage of nucleation and growth were separated, leading to narrow size distribution of CdSe semiconductor nanocrystals. The full width at half-maximum (FWHM) of fluorescence spectrum of CdSe nanocrystals could be reduced to 27.6 nm as optimizing the ratio of DDA to OLA and reaction temperature. Besides, through mixed amines as ligands, CdSe semiconductor nanocrystals which emitting fluorescence ranged from 530 nm to 615 nm could be synthesized by using less amount of Cd. So an environmental friendly method to synthesize full-color emitting CdSe semiconductor nanocrystals would be possible.
研究领域:
材料科学
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2020
·
IF 4.3
Tao Huang,Jundong Zhu,Shengzhuo Ge,Tianyu Guo,Chongwen Jiang,Le Xie
Heterogeneous photo-Fenton reaction using BiFeO 3 as catalyst was considered as an efficient environmental remediation technique. However, its low catalytic performance limited its application. In this work, CdSe QDs with high electron mobility, small size effect and rich surface properties were loaded on BFO surface by stirring impregnation method. The photo-Fenton catalytic performance of catalysts under visible light irradiation was evaluated by the degradation of phenol. The results showed that the BFO with CdSe QDs uniformly distributed on the surface shows much better photo-Fenton degradation of phenol performance than that of pure BFO. Moreover, when the load content of CdSe QDs comes to 0.5 wt%, the degradation efficiency of phenol increased from 41.5% to 98.5% within 60 min. The results of photochemical experiments confirmed that composite catalyst had a good ability to separate photo-induced carriers and the experiments of free radicals trapping showed that the holes and OH radicals were important active substances. Based on the above research, the possible mechanism of photo-Fenton reaction of catalyst was expounded. Excellent photo-Fenton catalytic performance and superior stability make this material showing a good application prospect for the degradation of organic pollutants in wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2018
·Vol. 9
·期 1
·1-7
·
IF 12.353
Lv Bihu,Zhang Huichao,Wang Lipeng,Zhang Chunfeng,Wang Xiaoyong,Zhang Jiayu,Xiao Min
When closely packed into a high-density film, semiconductor nanocrystals (NCs) can interact with each other to yield collective optical behaviours, which are normally difficult to characterize due to the ensemble average effect. Here we synthesized semiconductor NC clusters and performed single-particle spectroscopic measurements to probe the electronic couplings of several giant CdSe/CdS NCs contained in one cluster with nanometer-scale separations. Such a single cluster exhibits multiple emission peaks at the cryogenic temperature with nearly identical photoluminescence decay dynamics, suggesting that the Förster-type energy transfer does not occur among the composing NCs. Surprisingly, strong photon antibunching is still observed from a single cluster, which can be attributed to the Auger annihilation of photo-excited excitons from different NCs. The isolation of several nearby NCs interacting with the above novel mechanism has marked a solid progress towards a full understanding and an efficient control of the operation parameters in NC-based optoelectronic devices.
研究领域:
材料科学
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光电子学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Yu-Jie Xi,Zi-Rong Zhou,Haris Niamat,Jianmin Chen,Feng Wang
In this study, a novel CdSe@PEI-PVP luminescent hydrogel was constructed by using MPA-CdSe quantum dots (QDs) as a single emitter and hydrogen bond cross-linking network between highly branched polyethyleneimine (PEI) and polyvinylpyrrolidone (PVP) as a hydrogel skeleton, in which PEI also works as a passivation ligand for MPA-CdSe quantum dots. Utilizing the dual emission of MPA-CdSe quantum dots and adjusting the surface state of MPA-CdSe with PEI and Cd 2+ , CdSe@PEI-PVP hydrogel can emit bright white light as a whole. Furthermore, CdSe@PEI-PVP shows specific recognition for Cu 2+ , luminescent color changes from bright white to orange when Cu 2+ is added, which enables CdSe@PEI-PVP hydrogel to serve as a fluorescent probe for ion detection. The luminescent hydrogel has great self-healing ability and reversible morphological thermal responsiveness, existing as a white luminescent hydrogel at room temperatures and transforming into a pale green luminescent solution at high temperatures.
研究领域:
材料科学
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 7
·1701-1709
·
IF 4.034
Changchang Ma,Mingjun Zhou,Dan Wu,Mengyao Feng,Xinlin Liu,Pengwei Huo,Weidong Shi,Zhongfei Ma,Yongsheng Yan
The effect of metal ion doping on the electronic structure and optical properties of CdSe quantum dots has been investigated by various characterization techniques and experiments. Various cation codoped CdSe quantum dot photocatalysts were synthesized via a hydrothermal method. The prepared quantum dots were examined using X-ray diffraction, fluorescence spectroscopy, X-ray photoelectron spectroscopy, high resolution transmission electron microscopy, and UV–vis diffuse reflectance spectroscopy. The activities of the photocatalysts were evaluated with respect to the photodegradation of tetracycline hydrochloride solutions under simulated sunlight irradiation. 3%Co–4%K/CdSe quantum dots showed a higher photocatalytic activity than others within 30 min of visible light irradiation. Furthermore, there was hardly any decrease in the catalytic efficiency after the fourth experimental cycle. Identification data illustrate that Co and K codoping may cause improvement in the photocatalytic performance of CdSe quantum dots, which is crucial for tetracycline hydrochloride degradation under simulated sunlight irradiation. Therefore, this study demonstrates a promising strategy for the design of highly efficient photocatalysts for the remediation of aqueous pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
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